Hi Kevin,

We were not able to replicate the problem - we tested with the following code:

using Nevron.Chart;
using Nevron.Chart.WinForm;
using Nevron.GraphicsCore;
using System;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }

  class MyPaintCallback : INPaintCallback
  {
   public MyPaintCallback(NChartControl chartControl)
   {
    m_ChartControl = chartControl;
   }
   public void OnAfterPaint(NPanel panel, NPanelPaintEventArgs eventArgs)
   {
    throw new NotImplementedException();
   }

   public void OnBeforePaint(NPanel panel, NPanelPaintEventArgs eventArgs)
   {
    bool requiresRecalculate = true;

    foreach (NSeries series in m_ChartControl.Charts[0].Series)
    {
     NPointSeries pointSeries = series as NPointSeries;
     if (pointSeries != null)
     {
      pointSeries.Size = new NLength(4, NGraphicsUnit.Pixel);
     }
    }

    if (requiresRecalculate)
    {
     m_ChartControl.document.Calculate();
     m_ChartControl.RecalcLayout();
    }
   }

   NChartControl m_ChartControl;
  }

  private void Form1_Load(object sender, EventArgs e)
  {
   NChart chart = nChartControl1.Charts[0];
   chart.DockMode = PanelDockMode.Fill;

   NPointSeries point = new NPointSeries();
   chart.Series.Add(point);
   Random rand = new Random();

   for (int i = 0; i < 20; i++)
   {
    point.Values.Add(rand.Next(100));
   }

   chart.PaintCallback = new MyPaintCallback(nChartControl1);

   nChartControl1.ImageExporter.SaveToFile("c:\\temp\\check.bmp", new NBitmapImageFormat());
  }
 }
}

And both the chart on the form and the exported image looked correct.

   /// <summary>Intercepts mouse move to allow a cursor change depending upon the object beneath</summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The <see cref="NMouseEventArgs"/> instance containing the event data.</param>
        /// <remarks>Code idea supplied by Nevron</remarks>
        public override void OnMouseMove(object sender, NMouseEventArgs e)
        {
            if (e == null)
                return;

             NControlView view = (NControlView)this.GetView();

            NHitTestCacheService hitTestService = view.GetServiceOfType(typeof (NHitTestCacheService)) as NHitTestCacheService;
            if (hitTestService == null)
                return;

            NHitTestResult hitTestResult = new NHitTestResult(hitTestService.HitTest(new NPointF(e.X, e.Y)) as NChartNode);
            INMouseService mouseService = (INMouseService) view.GetServiceOfType(typeof (INMouseService));

            bool cursorSet = false;
            if (hitTestResult.ChartElement == ChartElement.DataPoint && hitTestResult.Chart != null)
            {
                CartesianChartDefinition cartesianChartDefinition = hitTestResult.Chart.Tag as CartesianChartDefinition;
                ChartSeries series = cartesianChartDefinition?.ChartSeriesSet.HavingId((int) hitTestResult.Series.Tag);
                if (series != null && series.AllowDragging)
                {
                    mouseService.Cursor = cartesianChartDefinition.ChartLayout == CartesianChartLayout.Vertical ? Cursors.SizeNS : Cursors.SizeWE;
                    cursorSet = true;
                }
            }

            if (!cursorSet)
                mouseService.Cursor = Cursors.Default;

        }

Hi Kevin,
Understood - we exposed the property anyway and it will be available in subsequent builds Let us know if you meet any problems.